ORDER BY和子查詢

Question

我麻煩了basical存儲過程，可惜我不是一個SQL專家，我所要做的是排序2個參數，@OrderBy和@SortOrder提供結果，但結果進行排序只有子查詢的結果。 例如：

exec [dbo].[GetTest2] @Page=0,@Limit=150,@OrderBy=N'NetworkName',@SortOrder=N'asc' 

它能正常工作，但

exec [dbo].[GetTest2] @Page=0,@Limit=15,@OrderBy=N'NetworkName',@SortOrder=N'asc' 

不工作，因爲子查詢不返回所有記錄。

我怎麼樣在整個記錄？

USE [MyContext] 
GO 

SET ANSI_NULLS ON 
GO 
SET QUOTED_IDENTIFIER ON 
GO 
alter PROCEDURE [dbo].[GetTest2] 
    @Page int = 0, 
    @Limit int = 10, 
    @OrderBy nvarchar(50) = 'OfferId', 
    @Name nvarchar(100) = NULL, 
    @SortOrder nvarchar(50) = 'asc' 
AS 
BEGIN 
    SET NOCOUNT ON; 
    SELECT * FROM (SELECT ROW_NUMBER() OVER(ORDER BY @OrderBy) AS ROWNUMBER, 
        COUNT(*) OVER() AS [Total_Rows], 
        a.Name AS NetworkName, 
        o.* 

        FROM offers AS o 
        left outer join AffiliateNetworks AS a ON o.NetworkId = a.Id 

        WHERE (@Name IS NULL OR o.Name LIKE '%' + @Name + '%')) AS Paged 
    WHERE 

    Paged.ROWNUMBER > @Limit * @Page AND 
    Paged.ROWNUMBER <= (@Limit * @Page) + @Limit 

    order by 
        case 
         when @SortOrder <> 'asc' then NULL 
         when @OrderBy = 'Name' then Name 
         end ASC, 
        case 
         when @SortOrder <> 'asc' then NULL 
         when @OrderBy = 'NetworkName' then NetworkName 
         end ASC, 
        case 
         when @SortOrder <> 'desc' then NULL 
         when @OrderBy = 'Name' then Name 
         end DESC, 
        case 
         when @SortOrder <> 'desc' then NULL 
         when @OrderBy = 'NetworkName' then NetworkName 
         end DESC 

END 

Answer 1

，可以考慮添加的ROW_NUMBER中的排序保持一致分頁。我在CTE中封裝了子查詢，使其更容易閱讀。

ALTER PROCEDURE [dbo].[GetTest2] 
    @Page int = 0, 
    @Limit int = 10, 
    @OrderBy nvarchar(50) = 'OfferId', 
    @Name nvarchar(100) = NULL, 
    @SortOrder nvarchar(50) = 'asc' 
AS 
BEGIN 
    SET NOCOUNT ON; 

    ;WITH Paged AS (
     SELECT ROW_NUMBER() OVER (
      ORDER BY 
       CASE WHEN @SortOrder = 'ASC' 
        THEN (CASE @OrderBy WHEN = 'Name' THEN Name WHEN 'NetworkName' THEN a.Name END) END ASC, 
       CASE WHEN @SortOrder = 'DESC' 
        THEN (CASE @OrderBy WHEN = 'Name' THEN Name WHEN 'NetworkName' THEN a.Name END) END DESC) 
      ) AS ROWNUMBER, 
      COUNT(*) OVER() AS [Total_Rows], 
      a.Name AS NetworkName, 
      o.* 
     FROM offers AS o 
      left outer join AffiliateNetworks AS a ON o.NetworkId = a.Id 
     WHERE (@Name IS NULL OR o.Name LIKE '%' + @Name + '%') 
    ) 
     SELECT * 
     FROM Paged 
     WHERE ROWNUMBER - (@Limit * @Page) BETWEEN 1 AND @Limit 
     ORDER BY ROWNUMBER 
END 
GO 

正如評論所說，ROW_NUMBER可能不是最好的構建在SQL Server的更高版本的分頁。如果您正在使用至少2012或更高版本，那麼你可以使用OFFSET和FETCH NEXT做分頁。然後您的查詢變成如下所示：

SELECT 
     COUNT(*) OVER() AS [Total_Rows], 
     CASE @OrderBy WHEN = 'Name' THEN o.Name WHEN 'NetworkName' THEN a.Name END AS SortName, 
     a.Name AS NetworkName, 
     o.* 
    FROM offers AS o 
     left outer join AffiliateNetworks AS a ON o.NetworkId = a.Id 
    WHERE (@Name IS NULL OR o.Name LIKE '%' + @Name + '%') 
    ORDER BY 
     CASE WHEN @SortOrder = 'ASC' THEN SortName ELSE NULL END ASC, 
     CASE WHEN @SortOrder = 'DESC' THEN SortName ELSE NULL END DESC 
    OFFSET (@Page * @Limit) ROWS 
    FETCH NEXT @Limit ROWS ONLY; 

Answer 2

試試這個：

order by 
        case 
         when @OrderBy = 'Name' and @SortOrder = 'asc' then Name 
         when @OrderBy = 'NetworkName' and @SortOrder = 'asc' then NetworkName 
         end ASC, 

        case when @OrderBy = 'Name' and @SortOrder = 'desc' then Name 
         when @OrderBy = 'NetworkName' and @SortOrder = 'desc' then NetworkName 
         end DESC